This is a yt glitch that seems to happen way to often. But look how many videos that the yt servers are trying to keep up with. I waited a few hours for mine to correct it's self as well. And I have waited up to 2 days =/
Often the thumbnail has in fact updated on the server and it is just your local browser that is still showing you (and only you) the old version because it is still in the cache.
Press F5 on your browser to refresh the page and/or try to view the page in incognito mode (chrome) or in a private window (firefox)
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